Journal of Modern OncologyJournal of Modern Oncology1815-14341815-1442LLC Obyedinennaya Redaktsiya5259610.26442/18151434.2020.3.200220Research ArticlePrognostic relevance of the TNM classification 8th edition and new criteria of staging for retroperitoneal liposarcomaNeredS. N.<p>D. Sci. (Med.), Prof., Blokhin National Medical Research Centre of Oncology, Russian Medical Academy of Continuous Professional Education</p>nered@mail.ruVolkovA. Yu.<p>Graduate Student, Blokhin National Medical Research Centre of Oncology</p>79164577128@yandex.ruhttps://orcid.org/0000-0003-4412-2256KozlovN. А.<p>Cand. Sci. (Med.), Blokhin National Medical Research Centre of Oncology</p>newbox13@mail.ruStilidiI. S.<p>D. Sci. (Med.), Prof., Acad. RAS, Blokhin National Medical Research Centre of Oncology, Russian Medical Academy of Continuous Professional Education</p>istilidi@front.ruArcheryP. P.<p>Cand. Sci. (Med.), Blokhin National Medical Research Centre of Oncology, Russian Medical Academy of Continuous Professional Education</p>arhiri@mail.ruBlokhin National Medical Research Center of OncologyRussian Medical Academy of Continuous Professional Education301120202231201262811202028112020Copyright © 2020, Consilium Medicum2020<p>For the first time a section appeared for staging of non-organ retroperitoneal tumors in the UICC TNM classification 8th edition.</p>
<p>Aim.To assess the prognostic significance of the TNM classification eighth edition for the most common retroperitoneal tumors-liposarcoma.</p>
<p>Materials and methods.The distribution of patients by stages and survival in accordance with the TNM-8 classification were studied in192 patients with retroperitoneal non-organ liposarcoma (RLPS).</p>
<p>Results.In the TNM-8 classification, only the degree of malignancy of the tumor has a prognostic value, and the T-category does not reflect the actual size of the RLPS and is considered T4 in 93%, which leads to inadequate staging. During the 15-year period, there were no cases with stages II and IIIA, and the survival rate was estimated only in patients with stages I and IIIB. A TNM classification with new values of the T-category was proposed, which demonstrated a more adequate distribution of patients by stages and the reliability ofintergroup differences in the survival rate.</p>
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